Answer:
import java.util.Scanner;
public class StudentScores
{
 public static void main(String[] args) {
  Scanner scnr = new Scanner(System.in); 
  final int NUM_POINTS = 4; 
  int[] dataPoints = new int[NUM_POINTS]; 
  int controlValue; 
  int i; 
  controlValue = scnr.nextInt(); 
  for (i = 0; i < dataPoints.length; ++i) { 
      dataPoints[i] = scnr.nextInt(); 
  } 
  for (i = 0; i < dataPoints.length; ++i) { 
      System.out.print(dataPoints[i] + " ");
  } 
  System.out.println();
  for (i = 0; i < dataPoints.length; ++i) { 
      if(dataPoints[i] < controlValue){
          dataPoints[i] = dataPoints[i] * 2;          
      }
      System.out.print(dataPoints[i] + " ");
  }
 }
}
Explanation:
*Added parts highligted.
After getting the control value and values for the array, you printed them.
Create a for loop that iterates through the dataPoints. Inside the loop, check if a value in dataPoints is smaller than the contorolValue. If it is, multiply that value with 2 and assign it to the dataPoints array. Print the elements of the dataPoints